영어 독해 지문 해석과 주제 질문드려요

학교 내신 독해 지문인데 해석과 주제를 알려주실 수 있을까요?

It is all too easy to assume that everything in life is going to work out perfectly.
Some people plan their entire lives for years assuming that things will happen exactly as they hope.
For example, some college students begin planning at the beginning of their freshman year what classes they will be taking through graduate school and then where they will end up working.
The problem is, once they fail one class or have a bad experience that leads them to doubt their major, all of these plans fall apart.
In general, we should plan the future based on what we expect to happen.
Unfortunately, things do not always work out as we want, so we must be prepared for anything.